Boston Marathon underway amid tight security

A Boston police officer from the special operations unit patrols. Credit: Reuters

Almost 36,000 athletes will run in the 118th Boston Marathon today in the first running of the race since last year's bombing.

Boston Marathon bombings survivors before the 118th event. Credit: Reuters

Massachusetts Governor Deval Patrick said security will be tighter than ever for this year's running of the world's oldest marathon.

Elite runners including Ryan Hall and Meb Keflezighi race during the 2014 Boston Marathon. Credit: Reuters

Runners attending the event will have to use clear plastic bags for their belongings, and fans hoping to watch near the finish line are encouraged to leave strollers and backpacks behind.